Improvement in sectional



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. www5 l @mwa @WM www JOHN MGOONN, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SECTIONALSTEAM-BOWERS.

' Specification forming` part of Letters Patent No. 117,311, dated July 25, 1871.

To all whom it may concern:

Be it known that I, JOHN MCCONN, of Philadelphia, in the county of Philadelphia and State oi Pennsylvania, have invented certain Improvements in Sectional Steam-Boilers, of which the following is a specification:

My invention relates to that class of sectional steam-boilers in which the sections consist ot' 'water-chambers, one above another. The object of my invention is to improve the mode of connectingthe sections, and of obtaining a perfect circlilation from one section to another in this class oi' steam-boilers.

I obtain a circulation from one section to another by outside columns, which communicate by side apertures to the main sections, so that the only steam-j oints to be made are in these outside columns, and are easily made. The ends of the main sections, being whole, require only acommon joint.

Figure l is a top view of the boiler with the crownsection removed. Fig'. 2 is a front view, including the framework in place before the boiler. Fig. 3 is a vertical cross-section of a single section. Fig. 4 is the same taken at right angles with Fig. 3. Fig. 5 is a vertical cross-section oi' the whole boiler and front, the cross-pipes being omitted. Fig. 6 shows an optional plan for bolting the joints of the columns.

A, end view ofthe main sections, which are cast hollow, (Fig. 1,) B, cross-pipes; C, outside columns; D, man-hole doors; E, apertures for regulating the draught 5 F, door to the lire-chamber; G, door to the ash-pit; H, smoke-pipe; I, steampipe. A in Fig. 5 shows how the joints are made, with a half-round fitting a hollow groove upon the ends ofthe main sections. The joints in the columns are made by allowing,` the sections to lap each other, and long bolts extend up through them all and hold them iirml y together, but Fig. 6 shows how iianges upon the columns with short bolts may b e used itl desired. Fig. 3 shows the cross-pipes inclined, and Fi g'. @L shows them wed geshaped. This shape and inclination of these pipes i'avor the circulation.

I claim as my inventionrIhe outside columns C, with communicatingapertures to the main sections, by which the ends oi' the main sections may be left whole, substantially as and for the purpose herein set forth.

l J OHN MGGONN. lVitnesses:

TH. DALLAS, Gno. 1t. Moenia. 

